Highly stable petroleum pitches provide access to the deep glassy state
Differential scanning calorimetry (DSC) was used to study the fast aging behavior of two petroleum pitch materials despite being only three to five years old.
Chemistry↗
SEARCH · Engineering Papers
Results for “polymer science”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Obstructed swelling and fracture of hydrogels
When swelling hydrogels encounter obstacles, they either expand around the obstacles or fracture, depending on obstacle geometry.
Chemistry↗
Tough polycyclooctene nanoporous membranes from etchable block copolymers
Polycyclooctene-polylactide triblock copolymer synthesis and subsequent processingviasolvent casting, polylactide etching, and plasma etching to yield tunable and tough nanoporous membranes with high surface porosities and hydrophilic properties.
Chemistry↗
Interfacial energy as an approach to designing amphipathic surfaces during photopolymerization curing
Photopolymerization induced phase separation (PIPS) is utilized to develop materials in a single step that are hydrophobic on one face and hydrophilic on the other.
Chemistry↗
Probing wrapping dynamics of spherical nanoparticles by 3D vesicles using force-based simulations
This computational study shows that the interactions between nanoparticles and vesicles of diverse shapes are influenced not just by particle size and the extent of wrapping, but also by their initial positions and the sequence of interactions.
Chemistry↗
Block copolymer self-assembly derived mesoporous magnetic materials with three-dimensionally (3D) co-continuous gyroid nanostructure
Magnetic nanomaterials are gaining interest for their many applications in technological areas from information science and computing to next-generation quantum energy materials. While magnetic materials have historically been nanostructured through techniques such as lithography and molecular beam epitaxy, there has recently been growing interest in using soft matter self-assembly. In this work, a triblock terpolymer, poly(isoprene-block-styrene-block-ethylene oxide) (ISO), is used as a structure directing agent for aluminosilicate sol nanoparticles and magnetic material precursors to generate organic–inorganic bulk hybrid films with co-continuous morphology. After thermal processing into mesoporous materials, results from a combination of small angle X-ray scattering (SAXS) and scanning electron microscopy (SEM) are consistent with the double gyroid morphology. Nitrogen sorption measurements reveal a type IV isotherm with H1 hysteresis, and yield a specific surface area of around 200 m 2 g −1 and an average pore size of 23 nm. The magnetization of the mesostructured material as a function of applied field shows magnetic hysteresis and coercivity at 300 K and 10 K. Comparison of magnetic measurements between the mesoporous gyroid and an unstructured bulk magnetic material, derived from the identical inorganic precursors, reveals the structured material exhibits a coercivity of 250 Oe, opposed to 148 Oe for the unstructured at 10 K, and presence of remnant magnetic moment not conventionally found in bulk hematite; both of these properties are attributed to the mesostructure. This scalable route to mesoporous magnetic materials with co-continuous morphologies from block copolymer self-assembly may provide a pathway to advanced magnetic nanomaterials with a range of potential applications.
Chemistry↗
Quantitative measurement of cation-mediated adhesion of DNA to anionic surfaces
Single molecule force spectroscopy quantifies divalent-cation-mediated attraction of double-stranded DNA to an anionic self-assembled monolayer.
Hao, Xian↗
Achieving controllable and reversible snap-through in pre-strained strips of liquid crystalline elastomers
Deformable, elastic materials that buckle in response to external stimuli can display “snap-through”, which involves a transition between different, stable buckled states.
Chemistry↗
In situ aggregation and early states of gelation of gold nanoparticle dispersions
The aggregation and onset of gelation of PEGylated gold nanoparticles dispersed in a glycerol–water mixture is studied by small-angle X-ray scattering and X-ray photon correlation spectroscopy.
Chemistry↗
Shape equilibria of vesicles with rigid planar inclusions
Motivated by recent studies of two-phase lipid vesicles possessing 2D solid domains integrated within a fluid bilayer phase, we study the shape equilibria of closed vesicles possessing a single planar, circular inclusion.
Chemistry↗
Structural determinants of collapse by a monomolecular mimic of pulmonary surfactant at the physiological temperature
DPPC and cholesterol form a hexatic phase in a pulmonary surfactant, indicating that long range order is not required for the alveolar film to avoid collapse and sustain very low surface tensions.
Chemistry↗
Training physical matter to matter
A new paradigm for generating adaptive functionality in materials.
Chemistry↗
Thermal preconditioning of membrane stress to control the shapes of ultrathin crystals
A 2D phospholipid crystal (dark) grows within a fluid vesicle membrane (light), starting as a small flower shape. While the area of the crystal grows progressively, the flower shape is preserved, a result of tension pre-conditioning.
Wan, Hao↗
Impact of water and oleic acid on glycerol monooleate phase transition and bi-continuous structure formation in white oil
Small-angle X-ray scattering was utilized to investigate the morphological transition of glycerol monooleate under various compositions, temperatures, and additives such as water and fatty acids.
Chemistry↗
MFG-E8: a model of multiple binding modes associated with ps-binding proteins
Not provided.
Chemistry↗
Induced phase transformation in ionizable colloidal nanoparticles
Abstract Acid–base equilibria directly influence the functionality and behavior of particles in a system. Due to the ionizing effects of acid–base functional groups, particles will undergo charge exchange. The degree of ionization and their intermolecular and electrostatic interactions are controlled by varying the pH and salt concentration of the solution in a system. Although the pH can be tuned in experiments, it is hard to model this effect using simulations or theoretical approaches. This is due to the difficulty in treating charge regulation and capturing the cooperative effects in a colloidal suspension with Coulombic interaction. In this work, we analyze a suspension of ionizable colloidal particles via molecular dynamics (MD) simulations, along with Monte Carlo simulations for charge regulation (MC-CR) and derive a phase diagram of the system as a function of pH. It is observed that as pH increases, particles functionalized with acid groups change their arrangement from face-centered cubic (FCC) packing to a disordered state. We attribute these transitions to an increase in the degree of charge polydispersity arising from an increase in pH. Our work shows that charge regulation leads to amorphous solids in colloids when the mean nanoparticle charge is sufficiently high. Graphical abstract
36 MATERIALS SCIENCE↗